Abstract: A finger mountable device for controlling a computer using a compact and highly portable control that does not need to be rested on a surface. The finger mountable device for controlling a computer includes a housing for mounting on a finger of a user. The housing has a front wall and a rear wall and a perimeter wall extending between the front and rear walls. The housing has a finger aperture for receiving a finger of a user's hand. The finger aperture extends through the housing between the front and rear walls. A first control is mounted on the housing for controlling movement of a cursor on the computer. The first control may comprise a knob movable in a plurality of radial directions for effecting a movement of the cursor in a corresponding direction. Further, the knob may be movable inward toward the housing for causing transmission of a first signal to a computer. Optionally, a second control may be provided on the housing for causing transmission of a second signal to a computer.